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Net Pension Assets - Summary of Reconciliation of Net Pension Asset (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of net defined benefit asset (liability) [line items] |  |  |
Beginning balance | $ 8,826 | $ 6,050 | $ 2,522
Current service cost | (1,767) | (1,724) | (1,638)
Interest (cost) income | 210 | 173 | 110
Return on plan assets greater (less) than discount rate | (21) | 518 | 701
Experience (gain) loss | (2,033) | (1,052) | (809)
Investment return | 88 | 27 | 105
Gross benefits paid | (440) | (513) | (599)
Assumption changes | (226) | (67) | 222
Employer contributions | (1,677) | 3,970 | 3,749
Benefits paid | 215 | 236 | 183
Adjustments | 10 | 1,208 | 1,504
Ending balance | 3,185 | 8,826 | 6,050
Defined benefit obligation [member] |  |  |
Disclosure of net defined benefit asset (liability) [line items] |  |  |
Beginning balance | (16,498) | (14,468) | (12,778)
Current service cost | (1,767) | (1,724) | (1,638)
Interest (cost) income | (568) | (516) | (422)
Experience (gain) loss | (2,033) | (1,052) | (809)
Assumption changes | (226) | (67) | 222
Benefits paid | 1,095 | 1,329 | 957
Ending balance | (19,997) | (16,498) | (14,468)
Fair value of assets [member] |  |  |
Disclosure of net defined benefit asset (liability) [line items] |  |  |
Beginning balance | 25,946 | 22,273 | 18,559
Interest (cost) income | 778 | 689 | 532
Return on plan assets greater (less) than discount rate | (21) | 518 | 701
Investment return | 88 | 27 | 105
Gross benefits paid | (440) | (513) | (599)
Employer contributions | (1,677) | 3,970 | 3,749
Benefits paid | (880) | (1,018) | (774)
Ending balance | 23,794 | 25,946 | 22,273
Other employee benefits liability [member] |  |  |
Disclosure of net defined benefit asset (liability) [line items] |  |  |
Beginning balance | (622) | (1,755) | (3,259)
Benefits paid |  | (75) |
Adjustments | 10 | 1,208 | 1,504
Ending balance | $ (612) | $ (622) | $ (1,755)

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- Definition Benefits paid, net defined benefit liability (asset). + References No definition available. + Details
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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_f&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_140_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_i&doctype=Standard -URIDate 2017-03-09 + Details
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